Coherent optical multichannel receiver

Details Coherent optical multichannel receiver Coherent optical multichannel receiver

1994-11-08

1996-05-07

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359194, H04B 1006

Patent

active

055151973

ABSTRACT:
A coherent optical multichannel receiver includes a frequency down-conversion stage (10) having a laser local oscillator (12) for producing an IF signal which is applied to two frequency detection paths (26,28), the outputs from which are subtracted in a subtractor (30) to provide a data signal. AFC signal producing means (18,34) are also connected to the subtractor (30). In order to avoid a false lock occurring when the receiver is out-of-lock, detection means are provided for detecting an out-of-lock situation. The detection means is coupled either to a bandpass filter (36 or 38) to alter a property of the bandpass filter when the receiver is out-of-lock so that the subtractor (30) provides a positive output which is used to offset the frequency detection characteristic so that it has a single positive zero crossing or to an offset voltage input V.sub.ofs in the AFC loop. The offset is removed automatically when the receiver returns to a lock situation.

REFERENCES:
patent: 4556866 (1985-12-01), Gorecki

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